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Costs and Estimated Earnings in Excess of Billings - Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts (Detail) - USD ($)
Sep. 30, 2019
Sep. 30, 2018
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 18,707,000 $ 17,437,000
Estimated earnings 9,063,000 7,335,000
Costs and estimated earnings on uncompleted contracts 27,770,000 24,772,000
Billings to date 13,932,000 12,872,000
Costs and estimated earnings in excess of billings $ 13,838,000 $ 11,900,000 [1]
[1] The amounts as of September 30, 2018 have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 2 to the Consolidated Financial Statements.